In various embodiments, the present invention is directed to ABA triblock copolymers having crosslinkable poly(propylene fumarate A blocks and a more flexible poly(lactone) B block formed by sequential ring-opening polymerization and ring-opening copolymerization. These ABA triblock polymers made using ring-opening polymerization of one or more lactone monomers using a bifunctional initiator to form a poly(lactone) B block having terminal hydroxyl groups and the ring-opening copolymerization of maleic anhydride and propylene oxide followed by isomerization of the maleate double bond using an organic base to form the poly(propylene fumarate)(PPF) A blocks. When crosslinked photochemically using, for example, a continuous liquid interface production digital light processing (DLP) Carbon M2 printer, these ABA type triblock copolymers form durable elastomers with tunable degradation and elastic properties. In various embodiments, these polymers are shown to undergo slow, hydrolytic degradation in vitro with minimal loss of mechanical performance during degradation.

A method for improving L* color of polyethylene terephthalate polymer, the method including bis-hydroxylethyl-eneterephthalate being polycondensed to produce said polyethylene terephthalate polymer in a polyethylene terephthalate manufacturing process, and wherein said process requires an antimony-containing catalyst, the method comprising the steps of: i) adding said antimony-containing catalyst at a temperature in a range of a melting point of said BHET to an upper temperature of 220° C.; and ii) exposing said BHET in a molten state to glycol removal before addition of said antimony-containing catalyst.

A method for improving L* color of polyethylene terephthalate polymer, the method including bis-hydroxylethyl-eneterephthalate being polycondensed to produce said polyethylene terephthalate polymer in a polyethylene terephthalate manufacturing process, and wherein said process requires an antimony-containing catalyst, the method comprising the steps of: i) adding said antimony-containing catalyst at a temperature in a range of a melting point of said BHET to an upper temperature of 220° C.; and ii) exposing said BHET in a molten state to glycol removal before addition of said antimony-containing catalyst.

A method includes depolymerizing post-consumer or post-industrial recycled polyethylene terephthalate (rPET) to form bis(2-hydroxyethyl) terephthalate (BHET), and reacting at least a portion of the BHET with a catalyst to form an alcohol. The alcohol includes cyclohexanedimethanol (CHDM) or 1,4-phenylenedimethanol (PDM). Further steps of the method include polymerizing the alcohol in the presence of additional BHET to form a polyester. The polyester may include poly(cyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate glycol (PETG) copolyester, polycyclohexylene dimethylene terephthalate glycol (PCTG) copolyester, polycyclohexylene dimethylene terephthalate acid (PCTA), or a monomer having repeating units with the structure (I), wherein n is an integer having a value of at least 20.

##STR00001##

A method includes depolymerizing post-consumer or post-industrial recycled polyethylene terephthalate (rPET) to form bis(2-hydroxyethyl) terephthalate (BHET), and reacting at least a portion of the BHET with a catalyst to form an alcohol. The alcohol includes cyclohexanedimethanol (CHDM) or 1,4-phenylenedimethanol (PDM). Further steps of the method include polymerizing the alcohol in the presence of additional BHET to form a polyester. The polyester may include poly(cyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate glycol (PETG) copolyester, polycyclohexylene dimethylene terephthalate glycol (PCTG) copolyester, polycyclohexylene dimethylene terephthalate acid (PCTA), or a monomer having repeating units with the structure (I), wherein n is an integer having a value of at least 20.

##STR00001##

The present invention relates to a polyethylene terephthalate (PET) composition suitable for manufacturing heat resistant and/or microwaveable containers comprising at least one dicarboxylic acid; at least one diol; at least one nucleating agent; at least one or more crystallization suppressing agents; at least one or more additives; wherein the composition is characterized by at least one of the following properties: Intrinsic Viscosity>0.56 dL/g; Glass transition temperature (Tg)<60° C. and Crystallization exothermic peak temperature (Tch)<60° C.

To provide a biaxially oriented polyester film that has extremely low content of antimony, excellent hygiene, few foreign substances, excellent transparency and heat resistance, and is excellent in printability, workability, and productivity. A biaxially oriented polyester film characterized by a content of antimony in the film of 10 ppm or less, a content of phosphorus in the film of 25 ppm or more and 75 ppm or less, an intrinsic viscosity of the film of 0.51 dl/g or more and 0.70 dl/g or less, and a number of defects with a size of 1 mm or more is 1.0 or less per 1000 square meters of the film.

To provide a biaxially oriented polyester film that has extremely low content of antimony, excellent hygiene, few foreign substances, excellent transparency and heat resistance, and is excellent in printability, workability, and productivity. A biaxially oriented polyester film characterized by a content of antimony in the film of 10 ppm or less, a content of phosphorus in the film of 25 ppm or more and 75 ppm or less, an intrinsic viscosity of the film of 0.51 dl/g or more and 0.70 dl/g or less, and a number of defects with a size of 1 mm or more is 1.0 or less per 1000 square meters of the film.

A polymeric matrix adhesive composition and methods of preparing said compositions. A silane is added to a prepolymer urethane to react with the urethane and at least partially end-cap the urethane to produce a silane end-capped polymer component. A reinforcing extender and a thixotropic agent are reacted with the silane end-capped polymer component. The cured product of the polymeric matrix adhesive composition is waterproof, hydrolytically stable, and pH resistant.

Provided are a liquid crystal polymer (LCP) film and a laminate comprising the same. The LCP film has a first surface and a second surface opposite each other, and a ratio of a ten-point mean roughness relative to a maximum height (Rz/Ry) of the first surface is from 0.30 to 0.62. By controlling Rz/Ry of at least one surface of the LCP film, the peel strength of the LCP film stacked to a metal foil can be increased, and the laminate comprising the same can still maintain the merit of low insertion loss.